org.springframework.integration.samples.async.gateway.AsyncGatewayTest.java Source code

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Here is the source code for org.springframework.integration.samples.async.gateway.AsyncGatewayTest.java

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/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.integration.samples.async.gateway;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

/**
 * @author Oleg Zhurakousky
 * @author Gary Russell
 *
 */
public class AsyncGatewayTest {
    private static Log logger = LogFactory.getLog(AsyncGatewayTest.class);
    private static ExecutorService executor = Executors.newFixedThreadPool(100);
    private static int timeout = 20;

    @Test
    public void testAsyncGateway() throws Exception {
        ConfigurableApplicationContext ac = new FileSystemXmlApplicationContext(
                "src/main/resources/META-INF/spring/integration/*.xml");
        MathServiceGateway mathService = ac.getBean("mathService", MathServiceGateway.class);
        Map<Integer, Future<Integer>> results = new HashMap<Integer, Future<Integer>>();
        Random random = new Random();
        for (int i = 0; i < 100; i++) {
            int number = random.nextInt(200);
            Future<Integer> result = mathService.multiplyByTwo(number);
            results.put(number, result);
        }
        for (final Map.Entry<Integer, Future<Integer>> resultEntry : results.entrySet()) {
            executor.execute(() -> {
                int[] result = processFuture(resultEntry);

                if (result[1] == -1) {
                    logger.info("Multiplying " + result[0]
                            + " should be easy. You should be able to multiply any number < 100 by 2 in your head");
                } else if (result[1] == -2) {
                    logger.info("Multiplication of " + result[0] + " by 2 is can not be accomplished in " + timeout
                            + " seconds");
                } else {
                    logger.info("Result of multiplication of " + result[0] + " by 2 is " + result[1]);
                }
            });
        }
        executor.shutdown();
        executor.awaitTermination(60, TimeUnit.SECONDS);
        logger.info("Finished");
        ac.close();
    }

    public static int[] processFuture(Map.Entry<Integer, Future<Integer>> resultEntry) {
        int originalNumber = resultEntry.getKey();
        Future<Integer> result = resultEntry.getValue();
        try {
            int finalResult = result.get(timeout, TimeUnit.SECONDS);
            return new int[] { originalNumber, finalResult };
        } catch (ExecutionException e) {
            return new int[] { originalNumber, -1 };
        } catch (TimeoutException tex) {
            return new int[] { originalNumber, -2 };
        } catch (Exception ex) {
            System.out.println();
            // ignore
        }
        return null;
    }
}